Hello Darke218 and welcome to the forums.
I'm no expert here
, but i would suspect it's an issue with your latest changes.
That's the first thing i suspect/think if i have issues after i made a change(s).
Can you explain in detail what you changed?
I did fiddle around with some networksecurity policies the night before.
That info could help the SF experts help solve your issue.
Do you have a restore point/backup image from before the problem started?
Sorry i can't help with your current issue, but my advice going forward:
Make sure you have a Backup/Restore strategy in place to recover from issues.
I've learned this lesson (many times)
and I'm sure others would agree...
hope this helps,